Questions and Answers
A ray parallel to the principal axis, after reflection from a concave mirror, will pass through the ______.
principal focus
The intersection of at least two reflected rays gives the position of the image of the ______ object.
point
In the case of a convex mirror, a ray parallel to the principal axis will appear to diverge from the ______ focus.
principal
For clarity in ray diagrams, only ______ rays are typically considered when locating an image.
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Each small portion of the extended object acts like a ______ source in front of the spherical mirror.
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Study Notes
Image Formation by Spherical Mirrors
- An extended object acts like multiple point sources, with rays emanating from each point.
- For clarity in ray diagrams, two rays originating from a point are commonly considered.
- Key rays for image localization include:
- A ray parallel to the principal axis; for a concave mirror, it reflects through the principal focus (F). For a convex mirror, it diverges from F.
Characteristics of Images Formed by Concave Mirrors
- Image formation depends on the object's position relative to points: P (pole), F (focus), and C (center of curvature).
- Various outcomes for images based on object positioning:
- At infinity: Image at focus F, highly diminished, real and inverted.
- Beyond C: Image between F and C, diminished, real and inverted.
- At C: Image at C, same size, real and inverted.
- Between C and F: Image beyond C, enlarged, real and inverted.
- At F: Image at infinity, highly enlarged, real and inverted.
- Between P and F: Image behind the mirror, enlarged, virtual and erect.
Ray Diagrams for Image Formation by Lenses
- Spherical lenses also use ray diagrams to depict image formation.
- Important rays for representation in lenses:
- A ray parallel to the principal axis, after passing through a convex lens, refracts through the focus on the opposite side.
- In a concave lens, a parallel ray appears to diverge from the principal focus on the same side.
Characteristics of Images Formed by Concave Lenses
- A concave lens consistently yields a virtual, erect, and diminished image, regardless of the object's position.
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Description
This quiz focuses on the principles of ray diagrams related to spherical mirrors. It explores how each point of an extended object behaves as a point source and how to trace rays to locate images formed by the mirror. Test your understanding of the concepts involved in image formation through ray diagrams.
